Here is the full list of all 74 Kingdom Rush achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Have a single barbarian kill 10 enemies.
Earn 45 stars.
Summon 5 rock elementals in any one stage.
Teleport 250 or more enemies.
Defeat Gul'Thak and its minions.
Have your Paladins heal a total of 7.000 life.
Have your Paladins perform 100 Holy Strikes.
Build 4 Tesla towers in any stage.
Throw 500 or more axes.
Free the sasquatch on the Icewind Pass.
Find the elusive acorn.
Find the ninja master rat.
Help Fredo escape.
Complete the campaign.
Defeat Vez'nan.
Shoot 100 missiles.
Have your soldiers regenerate a total of 50.000 life.
Kill 10.000 enemies.
Disintegrate 50 or more enemies.
Have your soldiers survive the explosion of 300 demons.
Kill 50 enemies by poison damage.
Snipe 50 enemies.
Train 1.00 soldiers.
Sell 30 towers.
Train a hero up to max level.
Build all 8 towers specializations.
Send 1.000 soldiers to their deaths.
Train a hero up to level 5.
Hold 500 or more enemies with Wrath of the Forest.
Kill 100 enemies with meteor showers.
Earn 30 stars.
Defeat J.T.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat The Juggernaut
Upgrade all basic tower types to level3.
Build 150 towers.
Sell 5 towers in a single mission.
Recruit max elves at The Silveroak Outpost.
Kill 2.500 enemies
Catch a fish.
Kill 10 or more sheep with your hands.
Earn 15 stars.
Build 100 towers.
Use Rain of Fire 5 times in a single stage.
Open 5 information cards.
Call 10 waves early.
Call a wave within 3 seconds of the icon showing up.
Build 30 towers.
Kill 500 enemies.
Call all waves early in a single mission.
Kill one enemy.
Change soldiers' rally point 200 times.
Polymorph 50 enemies into sheep.
Kill 300 enemies with electricity.
Drop 1.000 or more bomblets with the cluster bomb.
Complete all heroic stages.
Complete all iron stages.
Defeat Sarelgaz and its minions.
Defeat Greenmuck and its minions.
Do not let The Kingpin escape.
Defeat 10 Troll Pathfinders while they're treading on ice.
Find the 5 legendary lost ice-shrooms.
Defeat Ulguk-Hai the Troll Warlord.
Defeat 9 legions before they replicate.
Defeat Moloch the Demon Overlord.
Defeat Myconid, the Rotten Fungus.
Kill 25 Shrooms without them poisoning your soldiers.
Have your Elves deal 10000 points of damage.
Capture the attention of the mysterious crow.
Discover the hidden monster under water.
Defeat Lord Blackburn to avoid war between kingdoms.
Kill 15 Wererats before they sicken any soldier.
Complete the campaign in Veteran mode.
Fire the Sunray 20 times.